ABB 1TGE120021R0110 可编程控制系统PLC模块卡件

ABB 1TGE120021R0110 可编程控制系统PLC模块卡件

ABB 1TGE120021R0110 可编程控制系统PLC模块卡件

PLD控制系统与电器控制系统的区别从控制方法上看，电器控制系统控制逻辑采用硬件接线。利用组电器机械触点的串联或并联等组合成控制逻辑。其连线多且复杂、体积大、功耗大，系统构成后，想再改变或增加功能较为困难。

另外，继电器的触点数里有限，所以电器控制系分的灵活性和可扩展性受到很大限制。而PL.采用了计算机技术，其控制逻辑是以程序的方式存放在存储器中，要改变控制逻辑只需改变程序，因而很容易改变或增加系统功能●系统连线少、体积小、功耗小，而且PC所谓“软维电器”实质上是存储器单元的状态，所以“软维电器”的触点数里是无限的，PL.系统的灵活性和可扩展性好。

从工作方式上看。在维电器控制电路中，当电源接通时，电路中所有继电器都处于受制约状态”即该吸合的结电器都同时吸合，不该吸合的电器变某种条件限制而不能吸合，这种工作方式称为并行工作方式。而PL的用户程序是按―定顺序循环执行，所以各软组电器都处于周期性循环扫描接通中,受同一条件制约的各个继电器的动作次序决定于程序扫抽顺序"这种工作方式称为串行工作方式。

从控制速度上看·维电器控制系统依靠机械触点的动力作以实现控制。工作频率低。机械触点还会出现扌动问题。而PI通过程序指令控制半导体电胳来实现控制的。速度快，程序指令执行时间在微秒级，且不会出现触点抖E动加问题。

ABB 1TGE120021R0110 可编程控制系统PLC模块卡件

The difference between PLD control system and electrical control system From the perspective of control method, the control logic of electrical control system adopts hardware wiring. The control logic is formed by combining the series or parallel connections of the mechanical contacts. Its connections are many and complex, large volume, large power consumption, and it is difficult to change or add functions after the system is formed.

In addition, the number of contacts in the relay is limited, so the flexibility and scalability of the electrical control system is greatly limited. And PL. The use of computer technology, its control logic is stored in the memory in the way of a program, to change the control logic only need to change the program, so it is easy to change or increase the system function ● The system connection is less, small size, small power consumption, and the PC so-called "soft dimension appliance" is essentially the state of the memory unit, so the "soft dimension appliance" touch points are unlimited. PL. The system has good flexibility and scalability.

From the way it works. In the electrical control circuit, when the power supply is switched on, all relays in the circuit are in a restricted state, that is, the junction of the suction is simultaneously sucked, and the electrical appliance that should not be sucked can not be sucked under certain conditions, this working mode is called parallel working mode. The PL user program is cyclic execution in a fixed order, so the soft components are in a periodic cycle scan on, subject to the same condition of each relay action order is determined by the program sweep order "This working mode is called serial working mode.

From the point of view of control speed, the electrical control system relies on the power of mechanical contacts to achieve control. Low operating frequency. Mechanical contacts can also have a breaking problem. The PI controls the semiconductor electrical skeleton by program instructions. The speed is fast, the execution time of the program instruction is in microseconds, and the problem of contact shaking will not occur.